WO2003015323A1

WO2003015323A1 - A dispatching method of packet data based on the capacity of mobile station

Info

Publication number: WO2003015323A1
Application number: PCT/CN2002/000153
Authority: WO
Inventors: Ning Su
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2001-08-06
Filing date: 2002-03-13
Publication date: 2003-02-20
Also published as: CN1400756A; CN1134918C

Abstract

The invention disclosed a dispatching method of packet data based on the capacity of mobile station, said method acquired the capacity parameter of channel SAW (stop and wait) of mobile station, and sent the parameter to packet data dispatching entity of UTRAN, said dispatching entity estimate whether said target mobile station of packet data is the same with the target mobile station of the last TTI, if not, send said packet data, or estimate whether the channel SAW capacity of the mobile station had saturated, if had, buffering store said packet data until sending the next TTI, or directly send it. Due to taking the channel's SAW capacity into full account, adopting said method can make the system dispatch the data according to the capacity of processing the data, improve the processing efficiency of packet data of the whole system, improve the utilization ratio of the resources of the mobile station, urge the designing of mobile station to better cost performance, and be conveninent for further reducing the power loss and cost of the mobile station.

Description

Packet data scheduling method based on mobile station capability

The present invention relates to packet data scheduling in a wireless communication system, and in particular, to a method for scheduling packet data based on a data processing capability of a mobile station.

Background technique

In a wideband code division multiple access system, circuit-switched data and packet-switched data have different characteristics. Circuit-switched data has real-time characteristics and can tolerate certain packet errors; packet-switched data can generally tolerate a certain delay, and the requirements for packet errors are as low as possible. Since the packet exchange data can have a time delay, the real-time limitation can be avoided, and a corresponding packet data scheduling strategy can be designed according to the needs in order to meet the requirements of system capacity and user business requirements to the greatest extent. Existing packet data scheduling strategies are based on channel quality, such as C / I (Signal-to-Interference Ratio) and user-based Round-Robin (polling) strategies. The C / I-based method performs scheduling based on the signal quality that each user can obtain in the cell in which the wireless system is located. For the user with the largest C / I, that is, the user with the best signal quality, priority is given to sending. Packet data; Users with poor signal quality, such as users at the edge of a cell, have a lower scheduling level for packet switching. The advantage of this scheduling strategy is that it can maximize the packet exchange data throughput rate of the cell. The disadvantage is that the scheduling obtained by each user is uneven, and users in the E-domain with poor signal quality may not receive data for a long time. Quality cannot be guaranteed. The Round-Robin strategy is to uniformly schedule the packet data of each user and give the same limited level. Although this can ensure that each user gets the same service, the data throughput rate of the entire community is not as good as the former, and the frequency utilization rate is not good. high. In addition, neither of the above two scheduling strategies considers users The processing capability of the receiving end, if the data processing capability of the receiving end of the user is not coordinated with the data scheduling of the system, it will also reduce the overall data processing capability of the system.

In a wideband code division multiple access system, downlink high-speed data packet switching services transmit data through a downlink shared channel. Taking time division sharing as an example, the base station allocates each user's data to different time intervals to obtain TTI (transmission Time interval) The more users get more transmission time, the less transmission time they get. Due to the requirements for packet switching error packets and delays, a hybrid automatic repeat request mechanism (HARQ) is introduced at the physical level of transmission and reception. In order to make full use of wireless channel resources, a multi-channel stop-and-wait (SAW) HARQ mode is usually selected. Generally, the 4-channel SAW method is the most common method for the complete cycle of continuous packet data transmission in the system. The reason why the 4-channel SAW method is used is because after the data is received, it is necessary to judge whether data retransmission is required based on the received data quality. At the same time, the feedback of ACK / NACK (acknowledgement 0 / non-acknowledgement) information also requires processing time. The 4 channels can ensure the delay processing in time without wasting system resources. In the system, the sender is a base station, which can withstand high hardware complexity, and the turbo code encoder for sending data is not complicated. For the receiver, the hardware size of the mobile station (UE) is limited, and The complexity of the Turbo code decoder is much larger than the encoder. If the mobile station has a 4-channel decoder at the same time, it will greatly increase the power consumption and cost of the mobile station. Refer to Figure 2 for the time relationship diagram of the 4-channel SAW. In Figure 2, the downlink control channel corresponds to the time of the data channel. After receiving the downlink control information and data, the mobile station needs a TTI time for decoding, and then sends an acknowledgement on the third acknowledgement channel relative to the downlink channel time. Information to sender UTRAN. After receiving the acknowledgment information, UTRAN needs a TX decoding to determine whether the data packet is successfully sent. If successful, the same can only be done in the relative The third TT acknowledged by the uplink (the fifth TTI relative to the downlink) sends other data packets; if it is unsuccessful, the data packet can only be retransmitted at the third TTI acknowledged by the upstream (the fifth TTI relative to the downstream). . According to the analysis of the processing delay above, the 4-channel SAW can make full use of the channel without wasting hardware resources.

With the development of the communication market, mobile stations are increasingly inclined to functional segmentation and customization. For mobile stations of high-end users, high-speed data services with high complexity and high prices can be obtained; for mobile stations of general users, services with reasonable performance-price ratio are preferred. For most users, the possibility of receiving multiple high-speed data at the same time is not high. Therefore, most mobile stations do not need the top-level configuration of 4-channel SAW, which can save power consumption and cost of mobile stations.

Summary of the Invention

According to the above, since mobile stations receiving downlink high-speed data may have different data processing capabilities, the object of the present invention is to provide a packet data scheduling method based on mobile station capabilities, which can be based on 'mobile station data The processing capacity is used for data scheduling, thereby improving the data processing efficiency of the entire system.

To achieve the above object, the method for packet data scheduling based on the capability of the mobile station provided by the present invention includes:

(1) Acquiring a mobile station channel SAW (wait-and-stop) capability parameter, and dispatching the parameter to a packet data scheduling entity of UTRAN (Universal Terrestrial Radio Access Network);

(2) preparing to send packet data;

(3) determine whether the target mobile station of the packet data is the same as the target mobile station of the previous TTI (transmission time interval), and if different, send the packet data, otherwise, (4) Determine whether the channel SAW capability of the mobile station is saturated. If the SAW capability of the mobile station is saturated, buffer the packet data and wait until the next TII is sent, otherwise send directly.

In order to make the present invention have better effects, the method further includes:

Set the mobile station with the best channel quality to have the highest priority. If the mobile station ’s channel SAW capability cannot meet the continuous packet data reception, in the complete time slice of the system's continuous packet data transmission, in addition to the TQ occupied by the mobile station, the remaining TTI is assigned to the mobile station with the second lowest quality. If the processing capacity of the mobile station still cannot make full use of the remaining TTI, it is allocated to the mobile station with the lower channel quality, and so on, and so on in the next system. Repeat the operation during the complete cycle of packet data transmission.

A corresponding bandwidth is allocated to the mobile station according to the channel SAW capability of the mobile station, and packet data is scheduled according to the bandwidth.

The acquisition of the SAW capability parameters of the mobile station channel described above is required when the RRC (radio resource control) is initialized or updated, or the mobile station is required to report it.

The sending of the mobile station channel SAW capability parameters to the packet data scheduling entity of UTRAN as described above is performed by the base station controller (RC).

Since the present invention fully considers the channel SAW capability of the mobile station when the system performs packet data transmission and transmission to the mobile station through the downlink channel, it can not only enable the system to perform data scheduling according to the data processing capability of the mobile station, but also improve the overall system packet The data processing efficiency can also improve the mobile station's resource utilization rate, and urge the mobile station to design in a more reasonable price-performance direction, which is convenient for further reducing the power consumption and cost of the mobile station.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a flowchart of an embodiment of a method according to the present invention; FIG. 2 is a relationship diagram of a 4-channel SAW method.

detailed description

In order to further understand the present invention, the present invention is described in further detail below with reference to the accompanying drawings.

In the downlink high-speed data service, because mobile stations have different capabilities for receiving packet data, when the base station sends packet data, mobile stations with weak processing capabilities, such as only 1-channel SAW capabilities, cannot transmit continuous packet data in the system. The packet data is continuously transmitted in the time domain of the complete cycle; for a mobile station with a strong processing capability, for example, having the capability of a 4-channel SAW, the packet data may be continuously transmitted in the time domain. In the process of initial connection establishment, the mobile station informs the base station controller of the parameters of the mobile station's capabilities through the base station (BS), which includes how many channels the mobile station has, and the base station controller can also issue processing capabilities to the mobile station at any time. Consult for relevant information. A Universal Terrestrial Radio Access Network (UTRAN) obtains parameters related to the processing capability of the mobile station from the core network level, and uses this as a basis for scheduling packet data for the mobile station. Assume that the complete cycle of continuous packet data transmission of the system is 4 T. When a mobile station has a 4-channel SAW processing capability, UTRAN can schedule continuous packet data for the mobile station; when the mobile station has a 3-channel SAW processing capability, UTRAN It can be scheduled to the mobile station for packet exchange data of no more than 3 consecutive TTIs, and can only occupy 3 transmission capacities in the 4 consecutive TTIs; when the mobile station has a 2-channel SAW processing capability, UTRAN can be scheduled to the mobile station Packet exchange data not exceeding two consecutive TTIs can only occupy two transmission capacities in four consecutive TTIs; when a mobile station has a 1-channel SAW processing capability, the packet exchange data that UTRAN can schedule to the mobile station is continuous Only 'possessed' among 4 TTIs 1 transmission capacity.

If packet data is scheduled according to the above principles, the efficiency of system data processing can be improved. The above principle can be used as a scheduling policy alone, or it can be combined with a packet data scheduling strategy based on the channel shield or a packet data scheduling strategy in a polling mode as a hybrid packet data scheduling strategy.

Therefore, in the wideband code division multiple access system, during the initial link between the mobile station and the UTRAN, specifically, if a radio resource control (RRC, Radio Resource Control) link is established, the mobile station is required to report The parameters of the mobile station capability are given to the base station controller, and the base station controller can store these parameters and assign them to UTRAN as a reference for resource allocation and so on. Of course, the base station controller may also request the mobile station to report the updated capability parameters at any time while the RRC remains connected.

FIG. 1 is a flowchart of an embodiment of a method according to the present invention. To implement the present invention according to FIG. 1, the channel SAW capability of the mobile station needs to be ranked. In this example, four levels are divided, 4-channel SAW capability, 3-channel SAW capability, 2-channel SAW capability, and 1-channel SAW capability. In practice, according to the actual packet data scheduling needs, it can also be divided into other levels, such as a maximum of 6-channel SAW capabilities or a 3-channel SAW capability.

The connection is established or updated through RRC, or the mobile station is required to report its channel SAW capability to the base station controller when needed. After the scheduling entity in the UTRAN obtains the channel SAW capability parameter dispatched by the base station controller, the packet data is scheduled and allocated according to the parameter. Specifically, when the target mobile station has a 4-channel SAW processing capability, UTRAN can schedule continuous packet-switched data to the mobile station; when the target mobile station has a 3-channel SAW processing capability, UTRAN can schedule to the mobile station no more than consecutively. 3 TTI packet exchange data can only occupy 3 transmission capacities in 4 consecutive TTIs; when the target mobile station has a 2-channel SAW processing capability, UTRAN can schedule the mobile station to not exceed 2 consecutive TTI packet exchange data , Can only occupy 2 transmission capacities in 4 consecutive TTIs; when the target mobile station has 1-channel SAW processing capability, the packet exchange data that UTRAN can schedule to the mobile station can only occupy 1 of 4 consecutive TTIs Transmission capacity.

When the method shown in FIG. 1 is specifically implemented, a SAW counter needs to be set to determine whether the channel SAW capability of the mobile station has been saturated. In this way, according to FIG. 1, in step 1, the mobile station channel SAW capability parameter is initialized when the RRC is established or updated; in step 2, the base station controller dispatches the parameter to the scheduling entity in UTRAN, and the scheduling entity receives the mobile When the channel SAW parameter of the mobile station is initialized, a SAW counter for each mobile station is initialized to zero; then step 3 is performed to prepare to send packet data to the mobile station; in the process of sending each packet, the data to be sent to a mobile station is prepared. The packet data is processed as follows in step 4 to determine whether the target mobile station of the packet data is the same as the target mobile station of the previous TTI. If they are different, perform step 5 to send the packet data, and then perform step 6 to place the mobile station. The SAW counter is set to 1; finally step 12 is performed to prepare for the transmission of the next packet. If the target mobile station of the packet data is the same as the target mobile station of the previous TTI, it is further determined in step 7 whether the channel SAW capability of the mobile station has been saturated, that is, whether the value of the mobile station's SAW counter is the same as the mobile station. The channel SAW values of the stations are equal. If they are equal, it indicates that the channel SAW capability of the mobile station is saturated. At this time, step 8 is performed to buffer the packet data, wait until the next Tx transmission, and then clear the SAW counter of the mobile station to zero. Go to step 12 to prepare for the next data packet. in case The value of the SAW counter of the mobile station is not equal to the channel SAW value of the mobile station, indicating that the channel SAW capability of the mobile station has not been saturated. At this time, step 10 is performed to directly send the data packet, and then the mobile station's SAW counter Add 1 and finally execute step 12 to prepare the next data packet to be sent.

The invention can be well combined with the strategy based on the channel shield or round robin. In the C / I-based tuning strategy, the mobile station with the best channel shield can continuously receive packet-switched data from the base station. Therefore, after considering the channel SAW processing capability of the mobile station, the mobile station with the best channel shield is given the highest priority. If the channel SAW capability of the mobile station cannot meet the continuous packet data reception, the continuous packet data transmission in the system In the complete cycle, in addition to the TQ occupied by the mobile station, the remaining TTI is allocated to the mobile station with the second lowest channel quality. If the processing capacity of the mobile station still cannot make full use of the remaining TTI, it is allocated to the lower channel quality. The other mobile stations, and so on, repeat the operation during the complete cycle of continuous packet data transmission in the next system. In other words, if the processing capability of the mobile station cannot meet the continuous packet exchange data reception, in addition to the TTI occupied by the mobile station among the 4 TTIs, the remaining mobile station is allocated to the mobile station with the second lowest channel quality; if the mobile station The remaining TTI is still not fully utilized, and it is allocated to the mobile station with the lower channel quality, and so on, and the operation is repeated in the next 4 TTI periods.

The combination process with the polling-based strategy is: allocating the corresponding bandwidth to the mobile station according to the channel SAW capability of the mobile station, that is, the percentage of the TTI of a single mobile station to the total TTI of the system's continuous packet data transmission cycle Then, packet data is scheduled according to the bandwidth.

Claims

Rights request

1. A packet data scheduling method based on mobile station capabilities, including:

(2) preparing to send packet data;

(3) determining whether the target mobile station of the packet data is the same as the target mobile station of the previous TTI (transmission time interval), and if different, sending the packet data, otherwise,

(4) Determine whether the channel SAW capability of the mobile station has been saturated, and if it is full, buffer the packet data, wait until the next TTI is sent, otherwise send directly.

2. The packet data scheduling method according to claim 1, further comprising: setting a SAW counter to determine whether the channel SAW capability of the mobile station is saturated. '

3. The packet data scheduling method according to claim 1, further comprising: setting the mobile station with the best channel quality to have the highest priority, if the channel SAW capability of the mobile station cannot meet continuous packet data reception, In the complete cycle of continuous packet data transmission in the system, in addition to the TTI occupied by the mobile station, the remaining TQ is allocated to the mobile station with the second lowest channel quality. If the processing capacity of the mobile station still cannot make full use of the remaining TTI, Then it is allocated to the mobile station with the lower channel quality, and so on, and the operation is repeated in the complete cycle of continuous packet data transmission in the next system.

4. The packet data scheduling method according to claim 1, further comprising: allocating a corresponding bandwidth to the mobile station according to a channel SAW capability of the mobile station, and performing packet data scheduling according to the bandwidth. .

5. The packet data scheduling method according to claim 1, wherein: said acquiring the mobile station channel SAW capability parameter is required when the RRC (Radio Resource Control) is initialized or updated, or when required, the mobile station is required to report.

6. The packet data scheduling method according to claim 1, wherein the step of dispatching a mobile station channel SAW capability parameter to a packet data scheduling entity of UTRAN is performed by a base station controller (RNC).

7. The packet data scheduling method according to claim 1, further comprising: dividing the channel SAW capability of the mobile station into four levels, 4-channel SAW capability, 3-channel SAW capability, and 2-channel SAW capability. And 1-channel SAW capability.